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Physics Test 21...

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  • Question 1
    4 / -1

    Hydrogen atom is exited from ground state to another state with principal quantum number equal to 4. Then, the number of spectral lines in the emission spectra will be

  • Question 2
    4 / -1

    The current I drawn from a 5 volt source will be

  • Question 3
    4 / -1

    In the circuit shown in figure, A and B are two cells of the same emf, E and of internal resistances rA and rB, respectively. L is an ideal inductor and C is an ideal capacitor. The key K is closed. When the current in the circuit becomes steady, what should be the value of R so that the potential difference across the terminals of cell A is zero?

  • Question 4
    4 / -1

    A coil of inductance 0.20 H is connected in series with a switch and a cell of emf 1.6 V. The total resistance of the current is 4.0Ω. What is the initial rate of growth of the current when the switch is closed?

  • Question 5
    4 / -1

    Mass of the earth is 81 times the mass of the moon and the distance between the earth and moon is 60 times the radius of the earth. If R is the radius of the earth, then the distance between the moon and the point on the line joining the moon and earth where the gravitational force becomes zero is

  • Question 6
    4 / -1

    A magnet of magnetic moment M and length 2l is bent at its mid-point such that the angle of bending is 60°. Now, the magnetic moment is

  • Question 7
    4 / -1

    Three identical uniform rods of the same mass M and length L are arranged in xy plane as shown in the figure. A fourth uniform rod of mass 3 M has been placed as shown in the xy plane. What should be the value of the length of the fourth rod such that the centre of mass of all the four rods lie at the origin?

  • Question 8
    4 / -1

    A metallic wire with tension T and at temperature 30°C vibrates with its fundamental frequency of 1 kHz. The same wire with the same tension but at 10°C temperature vibrates with a fundamental frequency of 1.001 kHz. The coefficient of linear expansion of the wire is

  • Question 9
    4 / -1

    For a gas, the difference between the two specific heats at constant pressure and constant volume is 4150 J kg-1 K-1 and their ratio is 1.4. What is the specific heat of the gas at constant volume in units of J kg-1 k-1?

  • Question 10
    4 / -1

    Among the following pairs, which one does not have identical dimensions?

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